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Nucleic Acids Research, 2002, Vol. 30, No. 18 4032-4039
© 2002 Oxford University Press

Oligomerization of the telomerase reverse transcriptase from Euplotes crassus

Libin Wang, Sierra R. Dean and Dorothy E. Shippen*

Department of Biochemistry and Biophysics, 2128 TAMU, Texas A&M University, College Station, TX 77843-2128, USA

*To whom correspondence should be addressed. Tel: +1 979 862 2342; Fax: +1 979 845 9274; Email: dshippen{at}tamu.edu

The telomerase ribonucleoprotein reverse transcriptase uses its RNA subunit as a template to synthesize telomeric repeats and maintain telomere tracts on chromosome ends. In the ciliate Euplotes crassus, the core telomerase ribonucleoprotein particle undergoes a developmentally programmed assembly into three higher order complexes after mating. Here, we provide evidence using oligonucleotide-directed affinity purification that all of the E.crassus telomerase complexes contain at least two enzyme active sites. Furthermore, we show using co-immunoprecipitation experiments that EcTERT, the telomerase catalytic subunit, undergoes multimerization in vitro. Two independent interaction domains were identified in EcTERT, one at the N-terminus that spans amino acids 186–354 and one at the C-terminus that spans amino acids 755–857. Unexpectedly, we found that TERT can form head-to-head, tail-to-tail and head-to-tail oligomers in vitro, implying that E.crassus telomerase has the potential to assume different conformations in vivo. Together, these data indicate that oligomerization is a conserved feature of telomerase and that the minimal functional unit of the enzyme is a dimer.


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